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Sultansazlığı Wetland is located at 70 km south of Kayseri city and it is placed at the center of Develi Closed Basin. South (Örtülüakar) and North (Kepir) Reedfields, Yay Lake and Çöl Lake are placed at Sultansazlığı Wetland. South and North reedfields have fresh water, Yay Lake has salty water, Çöl Lake which is placed at the Northwest of Sultansazlığı has very salty water. Aim of this study is to compare the evaporation from Sultansazlığı Wetland by using the different evaporation calculation methods and to compare the evaporation observations from fresh water and salty water. In the content of the study; evaporation from free water surface of Sultansazlığı had been computed by using Penman and Artificial Neural Network Model then the evaporation results were compared with the real evaporation observations. Additionally evaporations from salty and fresh water at Yay Lake (Yenihayat) Station are compared and it is determined that total annual evaporation of fresh water is 5.1% more than the total annual evaporation of salty water, Sultansazlığı Sulak Alanı Kayseri ilinin 70 km güneyinde bulunmakta olup, Develi Kapalı Havzası’nın ortasında yer almaktadır. Sultansazlığı Sulak Alanında; tatlı su içeren Güney (Örtülüakar) ve Kuzey (Kepir) Sazlık Alanları ile yarı tuzlu Yay Gölü ve sulak alanın kuzeybatı köşesinde yer alan, Yay Gölü ile bağlantılı, çok tuzlu su içeren Çöl Gölü bulunur. Bu çalışmanın amacı farklı buharlaşma hesabı yöntemleriyle Sultansazlığı Sulak Alanı’ndan gerçekleşen buharlaşmayı hesaplayarak hesap sonuçlarını karşılaştırmak ve Sultansazlığı Sulak Alanı’nda tuzlu ve yarı tuzlu sudan gerçekleşen buharlaşma miktarlarını karşılaştırmaktır. Çalışma kapsamında Sultansazlığı’nda serbest su yüzeyinden gerçekleşen buharlaşmanın hesabı için Penman ve Yapay Sinir Ağları Metotları kullanılmış olup hesaplanan buharlaşma değerleri gerçek buharlaşma gözlemleri ile karşılaştırılmıştır. Ek olarak Yay Gölü (Yenihayat) istasyonunda ölçülmüş olan tuzlu ve tatlı su buharlaşma değerleri karşılaştırılmış ve gözlem süresi içinde yıllık toplam tatlı su buharlaşmasının yıllık toplam tuzlu su buharlaşmasından maksimum %5,1 daha fazla olduğu tespit edilmiştir. &nbsp

The significant part of annual runoff volume of the basins located at high altitudes with great snow potential is produced by melting of the accumulated snow in spring months. Modeling of hydrograph accumulation during melting seasons of snow is important for the operation of water resources as efficient and sustainable as possible. In this study, the simulation of hydrographs of Sariz Creek watershed in Seyhan Basin was studied for the snow melting seasons (March-April) of 2004 and 2005. Snowmelt Runoff Model (SRM), which is widely used in hydrological modeling, was applied together with Remote Sensing (RS) and Geographic Information Systems (GIS) technologies for determination of snowmelt runoff volume. SRM requires some daily climatologic variables of temperature, precipitation and snow covered area. Daily snow covered area values were determined by analyzing of MODIS satellite images with GIS. In the simulation studies, two cases were assessed. Solution has been provided as two alternatives. The simulated and observed hydrographs were compared and found in harmony. To make better and more reliable models, some improvements starting from the field observation are proposed.

In this study, the traditional Voellmy model which has been widely applied since 1956 for all types of avalanches was used in defining the path length to compute the run-out distance of avalanches that occurred in UzungÖl. UzungÖl, a village which is located in a valley of North-Eastern Anatolia was chosen as a pilot project area since some fatal snow avalanches occurred in this area in the 1992 winter season. Due to limited data and field observations, dynamic and turbulence friction coefficients were taken as µ= 0.155 and ξ= 500 m/s2,respectively, for well defined slopes. Although it wasn’t possible to check most of the computed values which need to be measured during an avalanche, the run-out distance was found to be determined quite accurately. A number of the Voellmy coefficients were tested to compute the run-out distance, and the effect of those coefficients on the hydraulic parameters of the avalanche, such as discharge, velocity and depth, was investigated. Key Words: Voellmy coefficients, Run-out distance, Avalanche dynamic, UzungÖl&nbsp